IN THE eyes of this Coast mother, her teenage daughter is "bubbly", "bright" and "friendly", but the bullies who relentlessly taunt her instead see someone "worthless", "fat", "ugly" and "useless".

The woman - who wishes to remain anonymous to protect her 13-year-old daughter - said she's been forced to watch her child become a shell of her former self as she's worn further down by her detractors.

Nowhere is safe; the bullying once confined to the schoolyard now follows children everywhere through the device in their pocket.

"You don't deserve the oxygen you breathe" and "you should kill yourself" are among the comments the mother reads during daily inspections of her daughter's phone.

The mother is at the end of her tether after trying everything in her power to get the school to resolve the issue, including going to the police and the Department of Education.

She said she hopes speaking out will spark a conversation between parents and their children who may be getting bullied or even be bullies themselves.

"I'm so busy trying to fight the school because of it continuing," the mother said.

"It consumes me to the point I'm not functioning.

"I feel helpless."

Her daughter's behaviour first began to change last year with some tell-tale signs that have only gotten worse.

"I could see things were starting bother her," she said.

"She was spending a lot of time on her phone in secret.

"She was a bit withdrawn, a bit anxious about school."

Months on, the teen is making regular upset phone calls home to be picked up from school and her grades are starting to slip.

She was even driven to self-harm by the weight of it all and echoed the harsh words of her bullies when she told her mum, "I'm useless, I'm worthless, I don't deserve to live".

The teen is now seeing a psychologist, but there's rare moments at home when her family sees signs of the happy girl they once knew.

Dolly Everett's widely-reported suicide touched the mother a "bit close to home" and prompted her to talk further to her daughter about the issue.

"It's so tragic when it shouldn't have to come to someone killing themselves to be heard," she said.

"While I have confidence that I know her well enough to know she wouldn't do that, I don't know because these girls are hounding her so often."

The mother said the school's response to the bullying hasn't changed anything, but she's previously spoken to police who are willing to help her.

She now wants to see something similar to Ryan's Rule implemented in schools so if a parent has evidence of severe bullying causing their child mental distress, the school has to act accordingly.